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Creating a Component

In this tutorial, we will walk through the process of creating a component in Angular. Components are the fundamental building blocks in an Angular application, and understanding how to create and use them is essential for anyone learning Angular.

What is a Component?

In Angular, a component is a TypeScript class decorated with the @Component decorator. A component controls a portion of the screen, called a view. Every Angular application has at least one component, known as the root component.

A component is made up of three key parts:

Class: This is where you define properties and methods. The class interacts with the view via an API of properties and methods.
Template: This is the HTML that needs to be rendered in the view for the component.
Decorator: A decorator is a function that adds metadata to a class, its members (properties, methods) or its arguments. The @Component decorator provides Angular with the information it needs to create and present the component and its view.

Creating a Component

To create a component, follow these steps:

Import the Component symbol: The first step to creating a component is to import the Component symbol from Angular's core library.

import { Component } from '@angular/core';

Create the component class: Next, you need to create a class to hold the data and logic for your component.

export class YourComponent {
  // Your code here
}

Decorate the class with @Component: The @Component decorator is used to associate metadata with the component class. This metadata tells Angular where to get the major building blocks that it needs to create and present the component and its view.

@Component({
  selector: 'app-your-component',  // the CSS selector that identifies this component in a template
  templateUrl: './your-component.component.html',  // location of this component's template file
  styleUrls: ['./your-component.component.css']  // location of this component's private CSS styles
})
export class YourComponent {
  // Your code here
}

Define the component's data and logic: Inside your component class, you can define properties and methods that your component's template can bind to.

export class YourComponent {
  title = 'My Component';
  // more code here
}

Adding a Component to a Module

For Angular to recognize a component, it needs to belong to an NgModule. To do this, declare it in the declarations array of the NgModule.

Here's an example of how to do this:

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { YourComponent } from './your-component.component';

@NgModule({
  declarations: [YourComponent],
  imports: [BrowserModule],
  providers: [],
  bootstrap: [YourComponent]
})
export class AppModule { }

In this tutorial, we have learned how to create a component in Angular. We have understood what a component is, its different parts, and how to declare it in an NgModule. I hope you found this tutorial helpful. Happy coding!

What is a Component?
Creating a Component
Adding a Component to a Module